package com.shaopeng.singleton;
/**
 * lazy loading
 * 也称懒汉式
 * 虽然达到了按需初始化的目的，但却带来线程不安全的问题
 */
public class Mgr03 {
    private static Mgr03 INSTANCE;

    private Mgr03(){

    }

    public static Mgr03 getInstance(){
        if(INSTANCE==null){
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            INSTANCE=new Mgr03();
        }

        return  INSTANCE;
    }

    public static void main(String[] args) {
        for (int i = 0; i <100 ; i++) {
            new Thread(()->{
                System.out.println(Mgr03.getInstance().hashCode());
            }).start();

        }
    }
}
